Flux.



cARLEToN ELLIS, 0F WHITE PLAIN- UNITED STATES. PATENT o EIoE.

, NEW YORK, .isSIcNoR, BY DIRECT AND MESNE ASSIGNMENTS, TO ELLIS-FOSTER EOMPANY, A CORPORA TIQN OF NEW JERSEY.

Specification of Letters Patent Application filed March 23, 1906. SerialNo. 307,671-

FLUX.

Patented April 30, IQQZ.

To (ill whom, it may concern: Y

pt it knownv that I, CARLE'JON ELLIS, a citizen of the United States, and a resident of White Plains, inthe countyof \Vestchester .andStat-e of New York, have invented certain new andfuseful Improvements in Composition for Brazing Cast-Iron, of which the following is a s ecification.

My invention re ates to'a composition of matter for facilitating the soldering or brazing of cast iron surfaces and has for its object the attainment of a firmly soldered joint without the necessity of resorting to the high brazing temperatures heretofore employed,

all as more fully hereinafter pointed out, matters of novelty bein particularly enunciated in the, appended c aims.-

Owingto the impurities of carbon, silicon vetc, cast iron has proven peculiarly difiicult to solder or braze withouttheemployrnent of oxidizing fiuxes. 'Certain of these now in use contain heavy metallic oxids which, it is alle'ged, emove ,the impurities by selective oxidatio and form a sort of wrought iron surface to "which the solder or spelter will adhere. In attempting to braze cast iron with fluxes containing metallic oxids I have-found a very high temperature to be required to complete the operation and that suchfelevated temperatures produced,

'especiall 'withlar e articles as pulleys and irregular y shape castings, a ]series of stra ns and stresses; which might even be of so great severity as to cause fractures in the article at'some cooler portion remote from the seat of heatapplication. I have therefore conducted exhaustive experiments and ciently at a'. relatively low temperature.

tests' to obtain a flux which would braze e113; essential element of such a flux I have found in chemically pure and finely divided iron.

Another element is anhydrous borax or other easily fusible, non-oxidizing anhydrous salt orcompound. The action of a liux of this character,.viz: pureiron and anhydrous b0.-

mix, is to remove the impurities from the cast iron surfaces to be joined, by a sort of impregnation. In other words the chemically ure iron at a low red heat is most avidious or carbon, silica, etc, and absorbs these bodies from the cast iron surfaces with great rapidity. Thereby the surfaces are purified and put into condition for uniting with the the present invention. I am'jthefirst howduced. a The finely-divided chemically I pure "iron which I employ must be carefully prepared'.'

For this purpose oxalate of iron mayjie ignited In a current of hydrogen 01 the lron.

may be otherwise chemically prepared. Of. 60

course care must be taken in the production of this material from iron salts'thatthe iroIrl 4 is not yielded iii so finely divided a state as to be pyrophoric. r

So far my observations go it is well known to employ brazing compositions containing ordinary iron filings,-etc., containing to a greater or less degree the same impurities as cast iron'a'nd therefore. not-suited for ever, so far as I am advised, to realize and' make use of the peculiar propertiesiof chemically pure iron for the brazing. offcastironl; A. suitable composition for general purposes may be obtained by mixing thoroiwhly the following: Fused borax (pulverized- 12-1 lbs. Iron powder, C.P.40lbs. Carbonated? potash, G. P. 9 lbs. The last named 'ingre dient may however under certain circumstances be replaced by borax. A quantity of this mixture is worked up with Water to' a thick paste and is applied to thecold cast iron surfaces to be joined. The surfaces are, then pressed into contact and are heated by a ing of hubs, pulley spokes, propeller blades, 95

etc., do not obtain with my invention owing to the rapid action of the composition andtb the relatively low temperature required.

What I claim is:

1. Brazing flux which consists of chemicrooally pure iron and a-iusible' salt.

2. Brazing flux for castiron' which consists of chemically-pure finely divided iron; in-

hydrous borax and carbonate of potash.

-3. Composition for fluxing ca t iron supra;-

faces in the soldering thereof which consists solder or spelter which is subsequently intro 1 comprises an intimate mixture of pure iron powder and puiverized ani'iydrous horax.

8. Brazing flux for cast iron surfaces which consists of pure iron p. \\'der i orty parts,

anhydrous pulverized l': ore twelve parts, an d careonate of potash nine parts.

Signed at New York in the county oi New York and State of New York this 14th day oi March A D. 1906.

CARLE'ION ELIAS. W'itnesses:

FRED L SMiTn, FLETCHER P. SGOFIELD. 

